Quasi-two-dimensional phase fluctuations in bulk superconducting YBa2Cu3O7 single crystals
N.-C. Yeh, C. C. Tsuei
DOI 10.1103/PhysRevB.39.9708 · Physical Review B
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Abstract
A detailed study of the electrical transport properties in high-quality bulk single crystals YBa2Cu3O7 has manifested a Kosterlitz-Thouless (K-T)–type transition in the ab plane 0.2 K below the mean-field superconducting transition (Tc0=93.15 K). The c-axis correlation length lc(T=0)≃6 Å and a large two-dimensional effective mass (mab*/me∼10) of the supercarrier are estimated based on the K-T theory. The large effective mass suggests strong electron-electron correlations for the supercarriers confined in a quasi-two-dimensional sheet.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93.15 | Pressure not reported | midpoint |
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.97 | Pressure not reported | zero_resistance |
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